LONDON (Reuters) - Britain’s opposition Labour Party on Saturday called for an urgent inquiry into claims that Prime Minister Boris Johnson’s senior adviser broke lockdown rules with a 400 km journey to ensure childcare for his 4-year-old son.

Labour wrote to the country’s most senior civil servant, Mark Sedwill, asking for an urgent investigation.

“The British people have made important and painful sacrifices to support the national effort, including being away from family in times of need,” Rachel Reeves, Labour’s cabinet office minister in waiting, wrote in the letter.

“It is therefore vital that the government can reassure the public that its most senior figures have been adhering to the same rules as everyone else,” she wrote.